Why is Interceptor.attach different from gum_interceptor-attach, and why does gum_interceptor-attach modify code memory

[forgottor]

Why is Interceptor.attach different from Gum_interceptor-attach? Gum_interceptor-attach modifies code memory, but after injecting Interceptor.attach into JavaScript, the memory code does not change. How can GUM inject the code into the back page without changing the original assembly code